package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Autowired
    private RedisTemplate redisTemplate;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        return "/site/register";
    }

    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        return "/site/login";
    }

    @RequestMapping(path = "/forget", method = RequestMethod.GET)
    public String getForgetPage() {
        return "/site/forget";
    }

    /**
     * 注册的视图层
     * @param model
     * @param user
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()){
            // 注册成功，提示完跳到首页，需要激活, operate-result.html
            model.addAttribute("msg", "注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活！");
            model.addAttribute("target", "/index");
            return "/site/operate-result";
        }else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }
    }

    /**
     * http://localhost8080/community/activation/(用户id)/(激活码)
     * 激活账号的视图层
     * @PathVariable 从路径中取整数
     *
     */
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功！您的账号已经可以正常使用了！");
            model.addAttribute("target", "/login");
        }else if (result == ACTIVATION_REPEAT){
            model.addAttribute("msg", "请勿重复激活！");
            model.addAttribute("target", "/index");
        }else {
            model.addAttribute("msg", "激活失败，您提供的激活码不正确！");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

    /**
     * 这个方法给浏览器返回一个html，html包含图片路径，浏览器依据路径再次访问服务器，获得图片。
     * 跨请求，多个请求要用，登陆时使用
     * p34重构验证码模块，不用session，用redis
     */
    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response/*, HttpSession session*/) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        // 生成图片
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入session
        // session.setAttribute("kaptcha", text);

        // 验证码的归属者,cookie保存然后返回key
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        // 发送给客户端
        response.addCookie(cookie);
        // 将验证码存入redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);


        // 将图片输出给浏览器，什么格式的数据
        response.setContentType("image/png");
        try {
            // response作响应，获得输出流
            OutputStream os  = response.getOutputStream();
            // 向浏览器输出图片   工具类
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败" + e.getMessage());
        }

    }

    /**
     * 登录页面的表现层和页面请求
     * path路径被占用没有问题，但是后面请求方式要不同
     * 验证码需要取到生成的验证码去比，从session中取出来
     * 创建cookie需要返回响应response
     * equalsIgnoreCase指忽略大小写
     */
    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code,
                        boolean rememberme, Model model, /*HttpSession session,*/
                        HttpServletResponse response, @CookieValue("kaptchaOwner") String kaptchaOwner) {
        // 首先判断验证码
        // String kaptcha = (String) session.getAttribute("kaptcha");
        String kaptcha = null;
        // 从redis中取值
        if (StringUtils.isNotBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }
        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确");
            return "/site/login";
        }

        // 检查账号，密码
        /*
        传过期这个时间，是根据是否点击 记住我 这个框去判断的
        判断用户是否勾选
        redirect:/index 重定向到首页
         */
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) {
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        }else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    /**
     * 退出登录请求
     * @CookieValue("ticket") 表示从cookie中请求参数
     * 重定向默认get请求
     * @return
     */
    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }

}
